diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 38b2481aaae1..02809114fc79 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -2683,7 +2683,7 @@ static int uar_mmap(struct mlx5_ib_dev *dev, enum mlx5_ib_mmap_cmd cmd,
 	if (!dyn_uar)
 		return err;
 
-	mlx5_cmd_uar_dealloc(dev->mdev, idx, context->devx_uid);
+	mlx5_cmd_uar_dealloc(dev->mdev, uar_index, context->devx_uid);
 
 free_bfreg:
 	mlx5_ib_free_bfreg(dev, bfregi, bfreg_dyn_idx);